What to print on wood?

Love this idea, the author used some glossy paper to print the image via an inkjet printer, then quickly transferred it to the wood before it dries.  I believe you could use transparencies too for this.

http://hackaday.com/2014/04/16/inkjet-transfers-to-wood/?utm_source=feedburner&utm_medium=feed&utm_campaign=Feed%3A+hackaday%2FLgoM+%28Hack+a+Day%29